20.500.12556/RUL-137506 Influence of nickel on niobium nitride formation in as-cast stainless steels The influence of the nickel content and cooling rate on niobium nitride precipitation in as-cast stainless steels were analysed. Niobium microalloying is important for mechanical properties and the prevention of intergranular corrosion in stainless steels. However, coarse precipitates can negatively affect steel properties. The precipitation of NbN depends on thermodynamic conditions, which are dictated by the chemical composition and temperature. The thermodynamic computations were used to estimate niobium nitride precipitation. Additionally, segregation models were used to predict precipitation. Three steel batches with different nickel contents (9 wt.%, 4.7 wt.%, and 0.16 wt.%) were prepared in an induction furnace and cast into sand moulds. The polished and etched samples were examined with an optical microscope, followed by a more detailed examination using a scanning electron microscope. An automatic scanning electron microscope analysis of the niobium particles was performed to obtain particle number and size distribution. Primary niobium carbonitrides, eutectic phases, and heterogenous nucleations on MnS inclusions were observed. As the proportion of nickel in the solution decreased, the solubility of nitrogen in the melt increased, which is manifested by a lower formation of primary and eutectic niobium carbonitrides, while MnS non-metallic inclusions played an important role in the heterogeneous nucleation. stainless steel niobium nitrides niobium carbonitrides segregation cooling rate nerjavna jekla niobijevi nitridi niobijevi karbonitridi segregacija hitrost ohlajanja true false true Angleški jezik Slovenski jezik Članek v reviji 2022-06-20 08:12:14 2022-06-20 08:12:15 2022-09-15 04:15:18 0000-00-00 00:00:00 2022 0 0 16 str. iss. 4, art. 609 Vol. 12 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 2075-4701 10.3390/met12040609 104061187 metals-12-00609-v2.pdf metals-12-00609-v2.pdf 1 1488B6606637C0881B2195250D9353A9 baf4c0abef4ee1adb99c6a8b62ba206ef3564dc15ebf81687b3f9fb5698b54d5 fb7d1788-f05f-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157465 https://www.mdpi.com/2075-4701/12/4/609 1 bf7357ac-f05f-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157464 Naravoslovnotehniška fakulteta 0 0 0